Sound-box.



G L. COLEMAN.

' SOUND BOX.

APPLICATION FILED 3391212, 1907 946,01 5;, Eatenssd Jan: 191% W'ITNESSESprovide means iirr s as a rnnr enric GEORGE L. comment, or CAMDEN, NEWJERSEY, AssIeNoa 'ro vrc'roza TALKING MACHINE COMPANY, A ooaroanrron ornew JERSEY.

sounn iaox.

Specification of Letters Patent.

Patented Jan. it. 15nd;

Application filed September 12, 1907. Serial No. 392,443.

To all whom it may concern:

Be it known that I, GEORGE L. COLEMAN, a citizen of the United States,and a resident of the city of Camden, county of Camden, and State ofNeW-Jersey,il1ave invented certain new and useful Improvements inSound-Boxes, of which the following is a full, complete, and exactdescription.

The main Objects of my invention are to simplify the construction of thesound box;

with a view to rendering the parts readily removable and replaceable; toso design and combine the parts as to form a compact, neat and durableconstruction; to rovide an improved mounting for the iaphragm; to forpreventing injury to the provide an improved stylus bar mounting; toprovide an improyed yielding mounting for, the box; and to provide otherimprovements which will appear as the invention is further disclosed.

In the accompanying drawings: Figure 1 is a front elevation of a soundbox constructed in accordance with this invention; Fig. 2 a sideelevation of the same; Fig. 3 a bottom plan view of the same; Fig. 4: alongitudinal section of the same upon line 44 of Fig. 1 lookiin in thedirection of the arrows; Fig. 5 a i ragmentary perspective upon anenlarged scale of one side of the sound box casing; Fig. 6 a perspectivein detail of the stylus bar; and Fig. 7 a perspective in detail of theplate for securing the stylus bar to the box.

Referring to the drawings,

diaphragm; to

the device comprises a casing consisting of a flat annular plate 1,provided at its outer periphery with .a rearwardly extending cylindricalflange 2,

integral therewith and having upon its rear edge an outwardly extendingflat annular flange 3, the flanges forming a recess for the reception ofthe inner edge of a cylindrical cap or cover 4 having upon its frontedge an inwardly extending annular flange 5, forming the face of thebox.

lnjan internal groove between the front of the, plate 1 and the innersurface of the flanged cover 4 carried thereby, is a eylindrical ring 6,which forms a mounting for the diaphragm 7 The ring 6 is substantiallyrectangular in'cross section, and equal injwidth and outside diameter tothe width and diameter of the said groove. v

The circular plate 1 forming the rear side of the sound box is provided,concentric with its central aperture, with a yielding tubular extension10, of soft rubber or other suitable material, secured to the rear faceof the plate by means of the screws 11. This tubular extension has itsouter end reduced in outside diameter, and has within its bore anon-yielding bushing or lining 12 of brass or similar material, and isadapted to be secured over a sound conducting arm for transmitting thesound waves from the diaphragm to the usual amplifier.

The front and rear portions of the sound box casing are held together bymeans of screws 13 extending longitudinally of the box through theoutwardly extending flange of the rear plate of the box, and into therear face of the cylindrical cap forming the sides and front or the box.

The stylus bar has a fiat tapering inner portion 14, and timber isphonetically con nected at its inner end L5 of the diaphragm. The outer,portion 16 of the stylus bar is offset rearwardly from the innerportion, is

cylindrical in sha e, and has a central lonitudinal socket or thereception of a needie 17, which is held in place by a thumb screw 18.

The inner and outer portions of the stylus bar-are connected by means ofa plate 19 which is substantially uniform in thickness, and which hasthe front side 20 thereof bent inwardly away from the plane of the otherside, and extending in direction substantially oblique to the fiatportion of the bar, and is slotted to receive the outer end of saidportion, which is soldered or otherwise socured in position. The rearside of this plate which is semi-circular in' shape and in a planeperpendicular to the outer endof surface of the plate resting againstthe shoulder of the'bar formed by the reduced end. This plate 19 isfurther provided with lateral extensions 22, projecting oppositely in adirection parallel to the) diaphragm, the inner edges of theseprojections being in the same straight line, substantially in alinementwith the diaphragm, The outer ends of these projections are foldedinwardly,

any other suitable process.

.these connections 23 supporting the stylus bar, yet I do not limitmyself to this particular kind of material, as I have found that a verygood reproductipn of sound may be obtained when soft copper cylindricalwires are used instead of the; steel spring, thus showing that anyyielding connection, whether resilient or not, will produce good resultswhen used in this form of stylus bar.

The inner ends of the yielding connections rest upon a flattened surface24: of the side of the sound box casing. This flattened surface isprovidedwith a seini-lcircular recess 25 for the reception of the innerhalf of the inner end of the cylindrical portion of the stylus bar so asto permit the bar to vibrate without touching against the casing.

The yielding connections supporting the bar are held in place upon thisflat surface by means of the plate 26 which'is secured over theconnections by means of the screws 27 assing through the plate and intothe sound ox casing, the inner edge of the plate being provided with arib 28 substantially equal in thickness to the thickness of theconnections, the inner surface of the rib resting upon the flattenedsurface of the box, so

7 that the inner surface of the plate will remain parallel with theflattened surface of the box and will tightly hold the inner ends of theconnections against the flattened surface of the casing,

The arrangement of the stylus bar with respect to the sound box casingis such that the longitudinal axis of the stylus bar socket and the axisof oscillation of the stylus bar are substantially in the plane of thediaphragm, consequently the vibrations of the upper end of the stylusbar connected to the diaphragm will be in a line normal to thediaphragm, and will have, therefore, no tendency to buckle thediaphragm, as would be the case were the axis of oscillation of the barnot in the plane of the diaphragm. With this construction in mind, it isevident that I have provided a sound box of simple, durableconstruction, in which the parts are readily removable, and in which thestylus isso constructed and arranged as to reproduce with extremesensitiveness, and with great faithfulness, the sound waves traceduponthe record.

While I have shown this invention only as embodied in a sin le form, yetit is obvious 5 that various modi cations might be made in the form" andconstruction of this device within the scope of the appended claims,

seams without departing from the spirit of this invention or sacrificingany of the advantages thereof.

Having thus fully described my invention, What I claim and desire toprotect by Letters Patent is:

1. I11 :1 sound box, the combinationvwith a casing comprising twoseparate parts forming an annular internal groove, of a diaphragm, andan annular mounting for said diaphragm in said groove, said mountingbeing substantially rectangular in cross section and being equalin widthand diameter to the Width and diameter of said groove.

2. In a sound box, the combination with a casing, of a yielding tubularextension secured to the rear side thereof, and provided With aninternal annular recess and a nonyielding lining in said recess. j 35 3.In a sound box, the combination with a casing, of a yielding tubularextension secured to the rear side of said casing, and a non-yieldinglining in said recess, the inner edge of said linin being in contactwith the rear side of sai casing.

4. In a sound box, the combination with a casing, of a yielding tubularextension secured to the rear side of the said casing, and anon-yielding lining within said extension, the rear edge of said liningbeing spaced inwardly from the rear edge of said extension.

5. In a sound box, the combination with a casing, of a yielding tubularextension secured to the rear side of the said casing, and

a non-yielding lining within said extension the rear edge of'said liningbeing spaced inwardly from the rear edge of said extension, and theinner surface of said lining being flush with the inner surface of theportion of the yielding extension which is in the rear of the rear edgeof said lining.

6. In a sound box, the combination with a casing, of a yielding tubularextension secured to the rear side of said casing, and a non-yieldinlining within.said extension, the inner e ge of said lining being incontact with the rear side of said casing and the rear edge of the saidlining being spaced in 5 wardly from the rear edge of the saidextension.

7. In a sound box, the combination with a casing, of a yielding tubularextension secured to the rear side of the said casing and havin areduced outer end and non-yieldinig lining for said extension spacedinwardly from the outer edge of said reduced end, the inner surface ofsaid reduced end and saidlining being substantially flush.

8. In a sound box, the combination with a casing, of a yielding tubular.extension secured to the rear side of the casing and having its outerend reduced in outside diameter.

9. In a sound box, the combination with a casing, of a yielding tubularextension se-v eured to the rear side of the casing and having its outerend reduced in outside diameter, and a non-yielding lining coveringpart. of the inner surface ot said extension, the inner surface ofsaidolining being flush with the inner surface of the outer end of saidextension.

'10. la a sound box, the combination with a flat annular plate providedwith a rearwardly extending flange at its periphery terminating in anoutwardly extending fiat flange, of a cap secured over the periphery ofsaid plate and in the between said fian es, a yielding tubular extensionsecured to t e rear side of said annular plate concentric therewith andprovided with an internal annular recess, and a non yielding lining insaid tubular extension.

ll. In a sound box, a stylus bar provided with lateral extensionsterminating in folded ends and yielding supports for said bar so curedin the folds of said extensions.

12. 111 a sound box, a stylus bar, lateral extensions upon said barterminated in folded ends and resilient supports for said bar secured inthe folds of said ends.

13; in a sound box, a stylus bar comprising an inner portion, an outerportion oiiset from said inner portion, an intermediate portionconnecting said inner and outer portions, said intermediate portionbeing: provided with lateral extensions terminating in folded ends, andyielding supports for said stylus bar secured. between the folds of saidends,

14. in a sound box, a stylus bar comprising an inner flat taperingportion, an outer cylindrical portion provided axially with a stylussocket and an intermediate portion connecting aid inner and outerportions, said intermediate portion having a side turned ii'uvardly andslotted togreceive the outer .eni'i of said inner portion.

15. iii sound box, a stylus bar comprising an lnner portion, an outerportion and an intermediate portion, said outer portion being off-setfrom said inner portion and said intermediate portion being providedwith an lip-turned slotted portion to receive the outer end of saidinner portion and with an aperture to receive the inner end of saidouter portion.

16. In a sound box, a stylus bar comprising an inner portion, an outerportion, and

an intermediate portion, said ouier portion being offset from said innerportion, the central part of said intermediate portion beingsubstantially flat, and being provided with oppositely extending lateralprojections terminating in folded ends, ant. yielding suports for saidstylus bar secured between the 1.olds of said ends.

17'. in a sound box, stylus compr sing an inner portion, a cylindricalouter portion provided with a stylus socket, and an intermediateportion, said intermediate portion having a substantially fiatcentralportion of semi-circular shape upon one side conforming to thecylindrical lower portion of the bar, and being provided on its oppositeside with a bent slotted projection to receive the end of the innerportion of said bar, said intermediate portion being further providedwith oppositely extending lateral projections terminating in foldedends, and yielding supports for said bar secured between lhe folds ofsaid ends.

18. In a sound box, the combination with a casing having a flattenedside, of a stylus bar. a yielding support for said bar, one end of saidsupport resting upon the said flattened s1de,a plate resting upon theouter surface of said yielding support, and means to force said plateupon said yielding support to hold the same against said sound boxcasing, said plate being provided on one edge with a rib ofsubstantially'the same thickness as the thickness of the end of saidyielding support, whereby the inner surface of the plate is retained ina plane parallel to the flattened surface of the sound box casing.

19. In a sound box, the combination with a casing having a. flattenedside provided, with a semi-circular'recess, of a stylus bar having acylindrical outer end offset, from the inner end of said bar, said outerend projecting into said semi-circular recess but being spaced from thesurface thereof, spaced yieldingsupports for said stylus bar, the innerends of said yielding supports resting respectively upon the fiat sideof said sound box casing upon 0 posite sides of the semi-circularrecess, a at plate provided with a semi-circular recess on one edge, andwith a rib u on the opposite edge, and means for ho ding said fiat plateagainst said sound box casing, and'against the ends of saidyieldingsupports to retain said la therefrom, and an intermediate por- 1 tionofsubstantially uniform thickness con-' necting said inner and outerportions, said intermediate-portion having one side turned away from-thoplane of the other side and slotted to. receive the end ot one of saidother portions.

22. A stylus bar comprising an inner portion and an outer portion ofisettherefrom, and an intermediate portion, said interme: diate portionhaving one side'- turncd away r to receive one end of one of said firstmentioned portions, and having its other side apertured to receive oneend of the other of said first mentioned portions.

23. A stylhs bar comprising two portions offset from each other, and anintermediate portion connecting said first mentioned portions, saidintermediate portion having one side substantially oblique to one ofsaid ottset portions.

24. A stylus bar comprising two portions offset from each other, and aplate connecting said portions, said plate having one side substantiallyoblique to one of said portions, and being slotted to receive the same25. A stylus bar comprising two portions off-set from each other, and aplate connect ing said portions, said plate having o e sidesubstantially oblique to one of said portions.

26. In a soundbox, a stylus bar compris ing an inner portion, an outerportion and an intermediate portion, said inner portion being providedupon one side with a bent and slotted projection to receive the end ofthe inner portion of said bar.

27. In a sound box, a stylus bar comprising an inner portion, an outerportion provided with a stylus socket and an intermediate portionconnecting said inner and outer portions, said intermediate portionhaving a side turned inwardlyto receive the outer end of said innerportion.

28.111 a sound box, a stylus bar comprising two portions, and anintermediate portion, said intermediate portion having one,

side bent and slotted to receive one end of one of said first mentionedportions.

. 29. In a sound box, the combination with 'a casin of a ieldin tubularextension therefor, and a non-yielding lining for said extension, saidlining having a smooth cylindrical external surface.

GEQRGE L. COLEMAN Witnesses:

ALs'roN B. MoUL'roN, ALEXANDER PARK.

